7939256664 has 32 divisors (see below), whose sum is σ = 20004433920. Its totient is φ = 2625579936.

The previous prime is 7939256657. The next prime is 7939256669. The reversal of 7939256664 is 4666529397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7939256669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1299324 + ... + 1305419.

It is an arithmetic number, because the mean of its divisors is an integer number (625138560).

Almost surely, 2^7939256664 is an apocalyptic number.

It is an amenable number.

7939256664 is an abundant number, since it is smaller than the sum of its proper divisors (12065177256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7939256664 is a wasteful number, since it uses less digits than its factorization.

7939256664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604879 (or 2604875 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 57.

The square root of 7939256664 is about 89102.5064967311. The cubic root of 7939256664 is about 1994.9251893731.

The spelling of 7939256664 in words is "seven billion, nine hundred thirty-nine million, two hundred fifty-six thousand, six hundred sixty-four".